Search a npm package that is used in a project. This is useful to get ideas of how package is setup and used. github
rbac filename:package.json
Search repos with more than 100 stars. github
 rbac filename:package.json stars:>100
Search repos with more than 100 stars and a javascript repo.github
rbac filename:package.json stars:>100 language:javascript 
Search string ecs in a file with .tf extension. github
ecs extension:tf
Another practical example is to search for content that are usually in a certain path. For example circleci 2.0 files are are stored in <repo-root>/.circleci/config.yml. Say you want to find an example of psql usage in circleci manifest file: github
 psql filename:config.yml path:.circleci

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One liners

React/Serverless cognito starter
React github explorer
Terraform AWS EKS POC
JS/AWS ECS audit util
Django multi-tenant starter
Dockerized nginx for config tests
Serverless/React ui to manage ecs clusters